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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f23f2d647cc69b436e3cad7baa355b58f6c899f831ed2f1ab6c56f95dc97c3a' 
  AND token = 'wc9i4kW79Fu7NH3t0pCx3COhDdpGfaMxMy3dgt77Njw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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