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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292c3ee4a9093438a47255cd677a46a5c23d42630c9468344d8d18d68a831a0c' 
  AND token = '6n2KlTCpdL4zEbJa/3IHB9M7DJ3LAieNMk/lIzuQMLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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