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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017382d37a2120964399c68ad66eb332a9bd30505a29379f1691ace819f0e97f' 
  AND token = 'IZ6mfpjDIwDHotC523nNT94BRAKp1jBmfSZjP+NXvIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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