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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e432dc1139ae38f370119daaba23004b84a5d928305fd3eab5e431676ea7e4d5' 
  AND token = 'l+6eZv4O5F8BOP3gkP/D/u0vM27rofeFf/ASAoI4Akk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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