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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9735ed09b9b0dba8f4a7ae4ed9198dc87ada8903840d319f60a24bc724135ab5' 
  AND token = 't9RK46IuJy1v0fS1hDSUnsrjhHu+63wQJuLmiffpyUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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