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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2139b5f54ae86de72e9eb53c9c4371fdd3236b54716cf2d564c0defb8c6b8233' 
  AND token = '+ZHQUFn/75MpS6s2T4dAVqy9yTOvMXcTti3UMN8/Uhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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