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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c75153610232bd336a8b50132097a6e62c24d384701d2db531c1ba61c39dbd2' 
  AND token = 'rxIn483FCi0uLX8JGH6sFuLPaLtavTcq+m8CU0oVpsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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