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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6857840967c395f42e67f78ba8da4dd40ca87a873f89abdf1974477251b0e9d' 
  AND token = 'f9adwjHd4/fVVJAiu4oufUOoEZTX6z7aPykB6iDNk9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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