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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b90023a3b5bcc3357035ab985927fb5586503fe93c9e985b296a0e0651a960' 
  AND token = 'OfRZ+hDYNOwtNvlT0I+F3LhhzdLS11UHEOBdIXT+FUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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