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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7595ea13cf3b649a1cefd4c9f5efd24983dc0629b85af88f664225044a2f68' 
  AND token = 'CPyWQUPnxSNi5h5LAA4RxYyd36+H/chgSZ80eS84gk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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