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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb788366a5d51c78e40761f587d7f8e20892d6e4a69b0e23624f1f344e7ef57' 
  AND token = 'da4BbOVTUMtA+3eSFAhu9yuO0LL42B1Ut6PsY8w6BOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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