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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38f9d37face4d78f3c4c8b78566ffb8d7d13bc6c68d95294fa7739ed88312b2' 
  AND token = 'EKIBJ1x28n2jmBoQIfJe/xn9n9nzp6Y//D32kOzG1Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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