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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857def32844b75b96e38736a2ed9d6acd5215e9d2a760a53f97500aa8f6f1823' 
  AND token = 'HIOj+IRhQhlbLqDgSKyq2Nbica7Y4q6ttpMw62Fv2ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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