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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206856464a426578aeb9197322dd4f7ccc2cfc6a22fcb385bd5c615c4c0694eb' 
  AND token = '3YHMP66V4vcrM+R1ltdlCoBiIO5PElQZFVP2y130v3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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