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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a57f3d938e62aca9a887b4a678eabd6412ae6d8855ba59b0849a24fcafc3c8' 
  AND token = 'tX7ummIAl/4DHs+JCarsPr92xPjwdR0U3KDV//N5jjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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