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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f19bd98c0f7c0e7229d0e9e1109e264e71128772096cb5fff71f2e8b0697ec' 
  AND token = 'NuToEljVmDgXHmbIgkwpIEA0uY6VujCoS2f5J4cNxSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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