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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc1143d10963d34b5b2e8a81b462e4e30c051890630c85f5ae0410935fbebc3' 
  AND token = 'sVCkERcJ1egp2Am+1BN7YpgTRpuXJqZL5+wfImF5lfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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