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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d137587f2de3e126e939c1aa9cbc5f1b2de92bcc616b1b383ecf87a0167c6c9' 
  AND token = 'q/zD1YHo4Ie1YC3CSnOfeaQH0VYsuQbquThVfbOJbP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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