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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662dd59d272e40cf4d642e5e721986fd07fb10c530fd66eecb2539293d62b726' 
  AND token = 'TN74lp1ZmkmrtJgwUXFLCD4JRo0BsosBPhlkM0/UoG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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