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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe03c7a9c38c6c93d95f0cbf73679aa8b4a57c9ec5bd1dd6c18ac89046899b5' 
  AND token = 'n3tFY09LvKU2bTyxwlmEEG/lcdv3szZlabH6OksBolc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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