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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409f9d4104b119b0eb7b018ab79726cc43378c487af11b1b440e228b3e5481cd' 
  AND token = 'yJP7ZQgnqllKs+phvE7cHJ3PMO09aIN5fbOuFLCg2k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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