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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60340a3e5c4d0bac1afd25e9f8598216406699e8b3111423211abc923cb6e3da' 
  AND token = 'Q2adlOT1T+xWO9u01sEQ95i771Y6hcAab+5l7w16RGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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