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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa5d6b349296f69916ad042ad214e971cbdd4ab4a0fd1cb3944a262a956f7c0' 
  AND token = '9iMh9G+74MJQlUeecKa18U2/AnDS7ri5IE6fuTMyE/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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