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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9001bf175d4e0baf9e4ad533acb8309bb15019000ec1517c73aba02421b882c' 
  AND token = 'BDktNr6icDFZDYZ084snIWXya+AqgkZmD8yWo/hZPmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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