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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d9a8ab4ed1a529201a47d08dc6338107d21295bcf3aa8e1e428efc835ea774' 
  AND token = '512mB0cI2uJtKIzB8g8YIShOJhW3o/X0EzMJavuk5GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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