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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309b710effeaa534f5b9f770ff9e9171707a9563b8ce5c9014992ab0cea44b94' 
  AND token = 'g5pBeOSq9la4lQfGwcQY0/sjkuKy6uxxDFWOpBH8m3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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