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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb660efe0920ac02d052a607866dc7202d725fada7a7e2f3e1bfab761af3e74a' 
  AND token = '6+6aP9E4jTJQb5ALC+D7zFbe7FpeHeyOhqpY1+jmUms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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