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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd656b1cdeaac5e025333f30906fd085a55add4d33b51415807407a09ff8e30c7' 
  AND token = 'zoihbICZFheOWEVTZw2nFELg7BHH7//nv6Y1bRM3iB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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