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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d113d3a59924dcb6458bf310cf66b9973ff16d523b9a7dfb1223b69478dd8fc' 
  AND token = 'VtQgBP9WjbK+aNQ02TXU4krCCAH0m4VxDXejQgsR11Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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