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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e841b5e0c15fbeef2028db261758faf9b5ec804a3265fd83913f7f97bc8a79bb' 
  AND token = 'af28oUxDrxcLje1geRBv/cGDe3S9ZLNKiRXzkM45IXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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