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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc56f287782d27993c3827b7b3bd1b55f226abc94bf1c2a5f768613341a624a2' 
  AND token = 'DwDRraRRzkpmVByEZFj/5w3P11sidhl+DcEJc0nhM8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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