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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738e1997ec83110c69af3c0a0ce0c07bfecf5e1fbef1ba0eaec94f14d41f11d5' 
  AND token = 'rmpwGiHKxt3DXGJkxPIugR8cOYf1qA/04YGCzHx5Smk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}