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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd885c0c69bfe77a76e3c2a0ef4f2f69008247214fdaad39abd0e3e2b0adeff' 
  AND token = 'OARsLtYERfYPL1i2sWYOK5v/iJTk0fBGwkiG81EekLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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