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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295b770cb54a3abea1259a676008712f8bf7e0d2ba6ef8d7e4f0fc6b08c922c7' 
  AND token = 'ybbKBsM2ECg0pkkCAvzdUpttkGp/ENZGLmKtnhoermc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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