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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9dfa260720e7746417a299d61c902c06a20dd494168ab906fa00023f2169da' 
  AND token = 'esdD7tiubiKvF9hy+dEiKOxFwqaZV/Gii301u0/Y9+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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