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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee38578b39178fa884cd2ea4b86f4d21b96a1a5604c82dd717a0189990a6ad02' 
  AND token = 'Fo5pu2QwDMDGn7cGScbBRIWMw6R9GCN/aXKa3KOe+ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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