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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa13a8954829114ec7b0f3a248edc3684f4949dbe7c08339d279925df4df28b' 
  AND token = '9L+XPP5Py0x6Fc8aBnY/XufOo/DG/QaODK30cHlyqcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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