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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa924e6b4df18d0e9fef8c01821dfb19e0e503cb6d7c42df8536bc68dff70a4e' 
  AND token = 'R2NS0seGOUIvpG1MKVJKAAierlt1f4i22XfDQunz4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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