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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e08d2565ef2abe1a8f8a166cdbd9bc9ef0b7a1a76cad7caf83c6792651ad59' 
  AND token = 'FWwFmMAzJiFtkTeEsQKq9CyqSvBK74U3DjjEDzLjtqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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