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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf26a823e939417d0f8c4aa2fb04ae276eb7b58801c5e0b1276387265fa408b' 
  AND token = '3kS16diL5NjX+qGgJIjMrMhL6y9rGY16+A4YDhYo/90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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