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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531f305589aa7a19a322aefe9dd698f5e432c656ea3d51ed8faa8877d2c68df7' 
  AND token = '13EGVW/XVXZOBMu0yebczuqC4fDX6TbpnWd1kvY90MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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