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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd129fbbcd4e854699773baf09a73c43b2986e2d5d18ac1d90892654ddc04977' 
  AND token = 'Dpi+thDzNehxLa8pyVsi6C3o9Y+VkwSoGvX80yrS2mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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