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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18953868b52dc9c2a149da6ae2aafad83c5d51e071b44a46b148945fce215df' 
  AND token = 'iKHCk/B2fajLV795ht8mnyoJu3TCHbHijjX2b+fP81I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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