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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1aa1ced8214ab5d2799d8ad99058c0d96053cb27088637319dd8201969aa62' 
  AND token = 'UxpPnU30PtuJtpilWPv7zqhFrRIz0lyzMv6pDROap2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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