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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e130da199e92644940ebff9ba9b3f2857964a3d3bbf19e73d5ad37901147b57' 
  AND token = 'NxVAjQ+N+jfG6LTRthOO7LiEk7rsLM3A6nVXJ88/N88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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