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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8096b539277868e05f37c726cb65310506c5e2bc0481fd76785dc6343cb46524' 
  AND token = 'LHRKhaOvef0717lwaqxH+Nl32/EkYnAcwdVg3FKBLR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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