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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4676f7726c02ad340c487b36433f0454ec312c4ac41de2f9747cf1529ca390f3' 
  AND token = 'LEroEJG/nTzvIdCVNDiGwrVOKAODzu8eQnei0OuhZOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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