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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a5233e2c7695a3e2746f38c168e5c2ce7dd1fbd405e76ee93342eb967825ef' 
  AND token = 'eVhCSwBkExO4PIA1C3q896y9pQQXSwfUu1JxkeEbpec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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