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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d66ea0c0d7e838daf3c0f31812ed57455b25e06dd6761fc41e0ecc7a0246da' 
  AND token = 'lG2vEyHGuifW5wO6Tsy4k0QX2Wf5FKe5uh4xC+jQuTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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