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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ef5375aa6a683598a8a5e1c60f9819a953a9bd18206dda2fe1050847f0e1a8' 
  AND token = 'YtVodPPAfj5F5UUBX189A6MafNxnYfrR4cURgdu7BCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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