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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88570b7bba5755537efc92179d7f0a84fc92f70a273684e735b33a69c8777772' 
  AND token = 'fFJ6wJxfSnigPXvLggCDX5jNTGn1zAQdOvYVcD87Vok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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