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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926890ea191bf475feb3eed20c6590e0d235ff1273e4d620a864371b9d4add79' 
  AND token = 'q4RaqAvRoMu92ybqRf5KhxG2g9/iV307ycBWWBljrFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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