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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820029b9b8bcc948c5c3dc63275668e5ab298c5571c3348e42a0bda362c45896' 
  AND token = 'PL8sqCT28QV7232VJLj/rf8tCPeXS5cYUx8cbmNqJaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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