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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085c6c6c0a8aa62b19d8876c78f99a88a5f86a7d8c90982f196769e4017ab962' 
  AND token = 'pTpOm89HR6541BsLIdnPo4HCRAdEbrHrY6S6OwO5W9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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