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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef833e45d447145f9d5bab8597b4c83bcea7d7971576bcbd4cbe12132b136d0' 
  AND token = 'g+8ALt5upTEdDlITstO6T2KiIV8w2EkJiyC9fGb8Rwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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