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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88435382559478e916b4d3d60017f49b15ded38875e3a9817184baa4509c0db' 
  AND token = 'ufSxHzH9IaLFmPYJIgsF6poC3pa5zWuTw8mc88d0eAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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