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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5597940c112660095ef236745ea8630f5a47ea0ae44740e0da6969a23e8c558' 
  AND token = '2C3LHIwJKSoF92EmOrBt8uQpi0Jr+WdfFn/vnEtV450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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