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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c73de364ac74cf9a998780ea56c84c1e2712913c80fc53d509e96688ffd43dd' 
  AND token = 'k7fzj72Nc4V6nyYpwwW/tcE2CLKkgORL3UPUxXI/n+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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