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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28dcb3349e2157b14c9f8aef9f10d9958ec93512d6a15571f9478e9895df6f61' 
  AND token = 'GfUT16yV0he1Dw+lOV2agT6UsaTTKklgj9X1D1ZKLRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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