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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc878660bba288ca7de9e6736ebce4e3483493167996f6121768b8b4d00a5418' 
  AND token = 'Qd4G5rhH77uaTopknMubWUJm8/dxgR3FsC047dMRpXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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